Texas Instruments TI-80 Manual Book page 126

SUM
PROD
Sums and
Products of
Numeric
Sequences
8-10 Lists
(summation,
SUM
elements in the specified list.
SUM list
(product,
PROD
the elements of the list.
PROD list
You can combine
upper
G
expression(x)
x=lower
(N–1)
To evaluate G 2
, item 5) returns the sum of the
LIST MATH
, item 6) returns the product of
LIST MATH
SUM or PROD with
upper
x=lower
from N=1 to 4:
SEQ( to obtain:
expression(x)